Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b346c242394003f…

MALICIOUS

PDF

77.0 KB Created: 2021-09-22 22:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6acf9fa843543baf6dc833a6e1bf633 SHA-1: 1a5b211012bd26df52020e0bfe07dd587e8f9897 SHA-256: 6b346c242394003f0d30750467f587d7785da45e7e2587cca4338f725ae49f61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, suggesting a link farm designed to obscure the ultimate malicious destination. The presence of external URIs and the nature of the heuristics strongly suggest an attempt to redirect the user to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://antwerp-reefer-tournament.be/argt/files/77411910039.pdf In PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/pefugupe.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/87226722958.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/32725427356.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/rujudukurolijolowovam.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/suxabewapaxade.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/joxofuj.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/2887958125.pdfIn PDF document text
    • https://norservis.info/files/files/fagekuwilinuzenabesek.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/99773557721.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/duzuzatemipa.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/mituwizufesuvapelono.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/97151689542.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/3661835312.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/tomedimu.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/zefavorusen.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/zijakekodurigol.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a7a52ce86---rudokenal.pdfIn PDF document text
    • http://freetds.net/userfiles/file/59770593996.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/21548410114.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5221a5754---96583092961.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/duvekaxonawonelefezi.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/sepidodubal.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/zolagulefuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=u+player+pro+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 9996 bytes
SHA-256: 40b9849073e3e58550b3348f534219e4b8a98ec498201558d542500bc6703856
font_01_sfnt_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 18044 bytes
SHA-256: 6254a2385f83320ad8808e2372629387decfb6c3f6f0a99a978c9f73c639ecf6